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0. A. A. T. DE ST. AUBIN.

GALVANIO BATTERY AND SWITCH FOR TELEPHONE SYSTEMS.

N0.338,988. Patented Mar. 30, 1886.

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UNITED STATES PATENT OrEIcE.

CHARLES A. A. '1. DE ST. AUBIN, OF ST. LOUIS, MISSOURI.

GALVANIC BATTERY AND SWITCH FOR TELEPHONE SYSTEMS.

SFECIFICATION forming part of Letters Patent No. 338,938, dated March30, 1886.

Application filed August 1, 1885. Serial No. 173,265. (X0 model.)

To aZZ whom zit may concern:

Be it known that I, CHARLES A. A. T. DE ST. AUBIN, of the city of St.Louis, in the State of Missouri, have invented a certain new and usefulImprovement in Galvanic Batteries and Switches for Telephonic Systems,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, forming part of thisspecification and in which- Figure 1 is a perspective view of atelephone having my improvement. Fig. 2 is an enlarged perspective viewillustrating the same with the parts in the normal position. Fig. 3 is asimilar view showing the parts in the po sition for use. Fig. 4 is avertical section showing the parts in normal position, as in Fig. 2; andFig. 5 is a vertical section showing the parts in the position shown inFig. 3.

My invention relates to an improvement in galvanic batteries fortelephonic systems; and my improvement consists in features of noveltyhereinafter fully described, and pointed out in the claims.

The object of my invention is to obviate the greatest defect in theworking of telephones, which is due to the imperfection of frictionalcontact, the same being dependent on springs, which are liable to relaxand always corrode at the point of contact to such an extent as torender the action of the telephone very imperfect in time, and to renderit useless until it has been taken apart and cleaned or the springsrenewed.

The box A may be of any suitable shape.

B is a rock-shaft, having upon it an insulated arm, G, to which isjointed at D metal arm E,-to which is connected a conductingwire, F.Upon the arm E is a plate, G, of zinc or other metal, which, by themovement of the rock-shaft, is immersedin the liquid in the trough Hotthe galvanic battery, as shown in Figs. 3 and 5, or drawn therefrom intothe trough I, containing any non-corrosive liquid, as seen in Figs. 2and 4.

J is the porous cup of the battery, and K is a carbon or metal platetherein with a conducting-wire, L, connected thereto. The purpose ofwithdrawing the plate G from the acid bath into the bath ofnoircorrosive liquid is to avoid the corrosion of the plate when not inuse.

M and N are metal arms attached to the rock-shaft, but insulatedtherefrom. These arms may be in the same plane as the arm 0, or may varymore or less from said plane.

0 is atrough containing mercury, in which the ends of the arms M and Nare immersed when they are in a vertical position, as shown in Figs. 2and 4, so that there is electric connection between M and N through themercury, whereas when the ends of the arms are raised from the mercurybath, as seen in Figs. 3 and 5, there is no electric connection betweenthem. The surface of the mercury is covered with glycerine to preventthe oxidation of the metals beneath it.

P and Q. are conducting-wires connected, respectively, to the arms M andN. One of these wiressay P-extends to the central telephone-exchange, ifthe telephone is one of a number in connection with a central oflice, orin a private line to the magnetic bell, and the other to the ground.

The wires F and L are the linewires, one of which passes directly to thetelephone-receiver R, which hangs in the fork S of the rock-shaft. Theplane of the fork is transverse to the arms G M N. To prevent theremoval of the receiver from the fork S when the shaft is in the aboveposition, a guardnrm, T, extends outside the receiver, which extendssuch a distance that the rock-shaft must be turned into the positionshown in Figs. 3 and 5 before the receiver can be taken from the fork.The rockshaft has two flat faces, I) 0, against which bears a spring, U,whose oilice is to hold the shaft in either position in which it may beplaced.

I have described the plate G as drawn from the galvanic bath into thenon-corrosiw e liquid, and vice versa, by the movement of the rockshaftarm 0. I do not confine myself to the precise means shown foraccomplishing these movements; nor do I regard it as essential that themember G of the battery shall be immersed in the noncorrosive liquidwhen drawn from the acid bath, for it may be simply drawn out of theacid liquid or otherwise removed therefrom without immersion whileremoved. Either member G or K may be removed to break connection.

I claim 1. In combination with abox or case, a rockshaft or bar mountedtherein, a battery-cell in said case, an electrode mounted on saidshaft, and a hook for the receiver without the box on said shaft,substantially as and for the purpose set forth.

2. In combination with a telephone, a main circuit, an alarm-circuit,and a rock-shaft, to which one electrode of the battery of the maincircuit and the make and break of the alarmcircuit are secured in suchmanner that the making of one circuit breaks the other, as set forth.

, 3. The combinatiomwith a telephone and its circuit, comprising agalvanic battery and a separate alarm-circuit, of a rock-shaftto whichis secured one electrode of said battery and a.

pair of arms forming part of the alarm-circuit, and a cup of mercuryinto which said arms are dipped, for completing the alarm-circuit whenthe main circuit is broken, substanstantially as set forth.

4. In combination with a telephone, a battery-cell in two compartmentscontaining exciting and non-corroding fluids, respectively,

an electrode mounted on a hinged arm, and a rock-shaft whereto saidelectrode is connected, substantially as set forth.

5. In combination with a battery-cell having a movable electrode, a hookor support for the receiver of a telephone, and connection between saidhook and electrode, whereby the latter is operated by removing saidreceiver from and placing it upon said hook or support.

'6. The combination of a shaft with arm 0, connected to one element of agalvanic battery, and two arms, M and N, a mercury bath, a spring, U,and two faces, I) b, on the shaft, upon which the spring bears,substantially as and for the purpose set forth.

7. The combination, with a shaft connected with an element of a galvanicbattery, so as to remove the element from the battery by movement of theshaft, a fork on said shaft supporting the receiver, and an arm, T,preventing the removal of the receiver from the fork when the element isremoved from the battery.

CHARLES A. A. T. DE 8'1. AUBIN.

WVitnesses:

SAML. KNIGHT, GEO. H. KNIGHT.

